Definition
A Latin term from the civil law meaning, literally, "to come between." In legal usage, intervenire denotes the act of stepping into a legal proceeding or legal relationship that is already in progress — whether by substituting oneself for another party, assuming another's obligation, taking up the prosecution or defense of another's cause, or interceding on behalf of another. The term is the root of the English legal concept of intervention and appears in civil law texts and older common law sources as a technical term for any act of legal interposition between existing parties or obligations.
Common Language
Modern common usage (Wiktionary): To intervene; to come between parties or events; to intercede or interrupt a course of action.
Historical common usage (Webster's 1913): To come between; to occur between points of time or between events; to interpose.
The common meaning and the legal meaning are closely aligned in their core sense of "coming between." The legal significance of intervenire, however, is narrower and more formal: it describes a deliberate act with defined procedural or obligatory consequences — assuming another's debt, entering a lawsuit as a new party, or formally taking up a cause — not merely any act of interposition. The gap is one of legal formality and consequence, not of meaning.
Common Confusion
Intervenire should not be confused with a general act of mediation or informal intercession. In civil law usage, the term carries the specific sense of assuming legal standing or obligation — a party who intervenes in the civil law sense takes on binding legal consequences, not merely a persuasive or advisory role. Researchers encountering intervenire in translated civil law texts should read it with this formal sense in mind, rather than treating it as equivalent to mere interference or influence.
Why It Matters in Research
Intervenire is a Latin source term that functions primarily as a root and ancestor concept rather than a term of active modern legal usage. Researchers will encounter it most often in two contexts: (1) older civil law treatises and digests, where it appears as a term of art in discussions of suretyship, obligation, and party substitution; and (2) etymological glosses in legal dictionaries that trace the development of the English term intervention.
The key navigational point is that intervenire encompasses a broader range of legal acts than modern procedural intervention. In civil law sources, the term can describe assuming another's debt or obligation (what modern law might call novation or assumption), taking over the prosecution or defense of a suit (akin to substitution of parties), or interceding or supplicating on another's behalf (something closer to advocacy than formal party status). A researcher reading a civil law source who encounters intervenire should not automatically map it onto the modern procedural concept of intervention without checking which of these senses is operative.
The civil law heritage also means intervenire appears frequently in sources translated from Latin or from Continental European legal traditions, where the term may be rendered inconsistently in English — sometimes as "intervene," sometimes as "interpose," sometimes as "assume." Cross-referencing the Latin original against the translation is advisable when precision matters.
For researchers tracing the development of procedural intervention in common law jurisdictions, intervenire is the conceptual starting point. The modern rules governing intervention (such as Rule 24 of the Federal Rules of Civil Procedure and its state analogs) inherit the core idea from civil law practice, but the procedural mechanics diverged significantly as common law courts developed their own frameworks for managing third-party participation in litigation.
Historical Dictionary Support
Burrill's Law Dictionary provides the primary entry for this term among the historical shelf sources. Burrill traces the etymology directly — inter (between) + venire (to come) — and captures the full range of civil law meanings: intervening between parties, substituting for another, assuming an obligation, taking up a cause, and interceding or supplicating. The citation to Calv. Lex. (Calvinus, Lexicon Juridicum) indicates that Burrill drew on a standard civil law reference dictionary, which itself synthesized classical Roman law sources.
Burrill's entry is valuable for its breadth: it resists collapsing intervenire into a single meaning and instead presents the term as a cluster of related acts united by the idea of coming between. Researchers should note that this breadth is historically accurate — Roman and civil law usage did not draw the same sharp procedural lines that modern rules-based systems impose. The term's flexibility in historical sources is a feature, not an ambiguity to be resolved away.
What the historical dictionaries do not address is the term's downstream procedural development in common law jurisdictions, which is unsurprising given the civil law focus. For that development, researchers should consult entries under intervention and related terms in common law dictionaries and procedural treatises.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: INTERVENTION